door frame heater

例句：

1. 1.The door frame heater is a convenient wayto warm up the room quickly.
   门框加热器是一种快速加热房间的方便方法。
2. 2.The door frame heater is perfect for keepingthe cold out during winter.
   门框加热器在冬天保持寒冷方面非常完美。
3. 3. Thedoor frame heater can be used in bothindoor and outdoor settings.
   门框加热器可以在室内和室外使用。